CVE-2021-46816
📋 TL;DR
Adobe Premiere Pro versions 15.4 and earlier contain a memory corruption vulnerability that allows arbitrary code execution when a user opens a malicious M4A file. Attackers can exploit this to run code with the victim's privileges, requiring user interaction through file opening. Users of affected Premiere Pro versions are at risk.
💻 Affected Systems
- Adobe Premiere Pro
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control of the user's system, data theft, ransomware deployment, and lateral movement within the network.
Likely Case
Local privilege escalation leading to data exfiltration, malware installation, or system disruption for the affected user account.
If Mitigated
Limited impact with proper application sandboxing, user awareness training preventing malicious file opening, and network segmentation containing any breach.
🎯 Exploit Status
Exploitation requires user interaction (opening malicious file) but no authentication. Memory corruption vulnerabilities typically require some exploit development skill.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 15.4.1 or later
Vendor Advisory: https://helpx.adobe.com/security/products/premiere_pro/apsb21-67.html
Restart Required: Yes
Instructions:
1. Open Adobe Creative Cloud application. 2. Navigate to 'Apps' section. 3. Find Premiere Pro and click 'Update'. 4. Install version 15.4.1 or later. 5. Restart Premiere Pro after installation.
🔧 Temporary Workarounds
Disable M4A file association
allPrevent Premiere Pro from automatically opening M4A files by changing file associations
Windows: Control Panel > Default Programs > Associate a file type or protocol with a program
macOS: Right-click M4A file > Get Info > Open With > Change to different application
Application sandboxing
allRun Premiere Pro in restricted environment to limit potential damage
Windows: Use Windows Sandbox or third-party sandboxing tools
macOS: Use built-in sandboxing features or third-party solutions
🧯 If You Can't Patch
- Implement strict file handling policies preventing users from opening untrusted M4A files
- Deploy endpoint detection and response (EDR) solutions to monitor for suspicious Premiere Pro behavior
🔍 How to Verify
Check if Vulnerable:
Check Premiere Pro version in Help > About Premiere Pro. If version is 15.4 or earlier, system is vulnerable.Check Version:
Premiere Pro: Help > About Premiere ProVerify Fix Applied:
Verify version is 15.4.1 or later in Help > About Premiere Pro. Test opening known safe M4A files to ensure functionality.📡 Detection & Monitoring
Log Indicators:
- Premiere Pro crash logs with memory access violations
- Unexpected child processes spawned from Premiere Pro
- File access to suspicious M4A files
Network Indicators:
- Outbound connections from Premiere Pro to unknown IPs
- DNS requests for suspicious domains following file opening
SIEM Query:
process_name:"Adobe Premiere Pro.exe" AND (event_type:crash OR child_process_spawn:true) AND file_extension:".m4a"